<!--
  User: Gavin
  E-mail: GavinChangCN@163.com
  Desc: 
  Date: 2017-03-06
  Time: 22:44
-->
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3"
      xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout">

<head>
    <meta charset="utf-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
    <title>测试 WebSocket 的聊天室</title>
</head>

<body>
Welcome To Chat Room<br/>
<input id="text" type="text"/>
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<div id="message">
</div>
</body>

<script type="text/javascript">
    var websocket = null;
    connectWebSocket();
    function connectWebSocket() {
        //判断当前浏览器是否支持WebSocket
        if ('WebSocket' in window) {

            websocket = new WebSocket("ws://10.186.255.231:8089/xbbWebSocket"); // 本地 WebSocket 地址 ws
            console.log(websocket);
        } else {
            alert('Not support websocket')
        }

        //连接发生错误的回调方法
        websocket.onerror = function () {
            setMessageInnerHTML("error");
        };

        //连接成功建立的回调方法
        websocket.onopen = function (event) {
            setMessageInnerHTML("open");
        }

        //接收到消息的回调方法
        websocket.onmessage = function (event) {
            setMessageInnerHTML(event.data);
        }

        //连接关闭的回调方法
        websocket.onclose = function () {
            setMessageInnerHTML("close");
        }

        //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
        window.onbeforeunload = function () {
            websocket.close();
        }

        //将消息显示在网页上
        function setMessageInnerHTML(innerHTML) {
            document.getElementById('message').innerHTML += innerHTML + '<br/>';
        }

        //关闭连接
        function closeWebSocket() {
            websocket.close();
        }
    }

    //发送消息
    function send() {
        var message = document.getElementById('text').value;
        if (websocket != null) {
            websocket.send(message);
        }
    }
</script>

</html>